The usual thing where the contact between the inner battery tube and the outer PCB ring gets unreliable. Cleaning the tube end fixes it temporarily but then it acts up again soon. This is a TS10SG if that matters. The problem is apparently common with TS10's and also (maybe less so?) with the Emisar KR1AA.

Is there a more permanent fix than cleaning? Like applying some kind of plating or coating? If they make a titanium body TS10v3, would that help, since it shouldn't oxidize the way aluminum does? Should I give up and get a D3AA? I'm not that keen on the D3AA because of the larger head diameter. Hey Hank, a narrower, single emitter D3AA would appreciated ;).

Was there a titanium KR1AA at one point? I don't see it listed now.

Thanks